We do understand a lot about the brain and we know it is remarkably efficient at doing higher level thinking on a pretty paltry energy budget. It's not true we understand nothing about how people's brains operate. The generalisation capability of our mental models are pretty amazing.
One does have to consider that it also does a shitload of vision processing and muscle driving on top of all that thinking, while only drawing under 20 watts.
It can't however, reply to REST requests directly. Yet.
